1 /*
2  * Copyright (C) 2012 ARM Ltd.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15  */
16 #ifndef __CLKSOURCE_ARM_ARCH_TIMER_H
17 #define __CLKSOURCE_ARM_ARCH_TIMER_H
18 
19 #include <linux/timecounter.h>
20 #include <linux/types.h>
21 
22 #define ARCH_TIMER_CTRL_ENABLE		(1 << 0)
23 #define ARCH_TIMER_CTRL_IT_MASK		(1 << 1)
24 #define ARCH_TIMER_CTRL_IT_STAT		(1 << 2)
25 
26 #define CNTHCTL_EL1PCTEN		(1 << 0)
27 #define CNTHCTL_EL1PCEN			(1 << 1)
28 #define CNTHCTL_EVNTEN			(1 << 2)
29 #define CNTHCTL_EVNTDIR			(1 << 3)
30 #define CNTHCTL_EVNTI			(0xF << 4)
31 
32 enum arch_timer_reg {
33 	ARCH_TIMER_REG_CTRL,
34 	ARCH_TIMER_REG_TVAL,
35 };
36 
37 #define ARCH_TIMER_PHYS_ACCESS		0
38 #define ARCH_TIMER_VIRT_ACCESS		1
39 #define ARCH_TIMER_MEM_PHYS_ACCESS	2
40 #define ARCH_TIMER_MEM_VIRT_ACCESS	3
41 
42 #define ARCH_TIMER_USR_PCT_ACCESS_EN	(1 << 0) /* physical counter */
43 #define ARCH_TIMER_USR_VCT_ACCESS_EN	(1 << 1) /* virtual counter */
44 #define ARCH_TIMER_VIRT_EVT_EN		(1 << 2)
45 #define ARCH_TIMER_EVT_TRIGGER_SHIFT	(4)
46 #define ARCH_TIMER_EVT_TRIGGER_MASK	(0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
47 #define ARCH_TIMER_USR_VT_ACCESS_EN	(1 << 8) /* virtual timer registers */
48 #define ARCH_TIMER_USR_PT_ACCESS_EN	(1 << 9) /* physical timer registers */
49 
50 #define ARCH_TIMER_EVT_STREAM_FREQ	10000	/* 100us */
51 
52 struct arch_timer_kvm_info {
53 	struct timecounter timecounter;
54 	int virtual_irq;
55 };
56 
57 #ifdef CONFIG_ARM_ARCH_TIMER
58 
59 extern u32 arch_timer_get_rate(void);
60 extern u64 (*arch_timer_read_counter)(void);
61 extern struct arch_timer_kvm_info *arch_timer_get_kvm_info(void);
62 
63 #else
64 
65 static inline u32 arch_timer_get_rate(void)
66 {
67 	return 0;
68 }
69 
70 static inline u64 arch_timer_read_counter(void)
71 {
72 	return 0;
73 }
74 
75 #endif
76 
77 #endif
78